Terrorism in US. In the US it is a way way over exploited fear mongering by the right wing media and the Republican and TeaParties. There are a few crazies around but that has always been the case in the US. Just realize that you are being manipulated by people appealing to your emotions. The NRA says the way that you will be safer is to have everyone walking around with guns. Think about that for a moment!!
Rare events. A nuclear catastrophe is not imminent. The world is not going to end from radiation, heat waves, tornadoes, typhoons, lightening, floods, earthquakes, cold wave or any thing else like that. Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.